fix: emit signature-help parameter labels as UTF-16 offset ranges#142
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Unnamed method arguments (e.g. `get(::Base.EnvDict, k, def)`) were labeled with the internal `#unused#` placeholder, which violates the LSP requirement that a `ParameterInformation.label` be a substring of the signature label. Emit `[start, end)` UTF-16 offset ranges instead, computed positionally from the rendered signature so they stay unambiguous even for identically-rendered parameters. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Unnamed method arguments (e.g.
get(::Base.EnvDict, k, def)) were labeled with the internal#unused#placeholder, which violates the LSP requirement that aParameterInformation.labelbe a substring of the signature label. Emit[start, end)UTF-16 offset ranges instead, computed positionally from the rendered signature so they stay unambiguous even for identically-rendered parameters.Fixes julia-vscode/LanguageServer.jl#1357.